Portable band saw



FIG. 1 is a top left front perspective view of a portable band saw showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a right side elevational view;

FIG. 6 is a top plan view; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a portable band saw, as shown. 